Abstract: A chest piece for a wireless stethoscope system can be configured to receive, from the accelerometer, motion data; determine, based on the motion data, that the chest piece has experienced no moment for a time threshold; and command the chest piece to enter a sleep mode that consumes less power in response to determining that no moment has occurred for the time threshold.

Abstract: Disclosed modular animal collar systems include a D ring exoskeleton system, a breakaway latch tongue system and other systems. Disclosed collars may be self-orienting. Disclosed collars include auto release systems to ensure that collars do not choke or otherwise injure a pet. Collars include sophisticated electronics to commutate with a pet owner's smart phone but also include means of communication not requiring the use of a smart phone. Collars may include a base collar containing a micro controller and other computer related components. Surrounding modular components may contain additional equipment and may be added as needed by a pet owner. Disclosed collar functions are executed by the disclosed collars and facilitate the retrieval, care and training of a pet.